<template>
  <div id="home">
    <nav-bar class="home-nav"><div slot="center">易优购</div></nav-bar>
    <tab-control
      :titles="['流行','新款','精选']"
      class="tab-control1"
      @tabClick="tabClick"
      ref="tabControl" v-show="isTabFixed"></tab-control>

    <scroll class="content" ref="scroll" :probeType="3" @scroll="contentScroll" :pull-up-load="true" @pullingUp="loadMore">
      <home-swiper :bannwes="bannwes" @swiperImageLoad="swiperImageLoad"></home-swiper>
      <recommend-view :recommends="recommends"></recommend-view>
      <feature-view></feature-view>
      <tab-control
        :titles="['流行','新款','精选']"
        class="tab-control"
        @tabClick="tabClick"
        ref="tabControl" ></tab-control>
      <goods-list :goods="showGoods"></goods-list>
    </scroll>

    <back-top @click.native="backClick" v-show="isShowBackTop"></back-top>
  </div>
</template>

<script>
  import NavBar from "components/common/navbar/NavBar";
  import HomeSwiper from "./childComps/HomeSwiper";
  import RecommendView from "./childComps/RecommendView";
  import FeatureView from "./childComps/FeatureView";
  import TabControl from "components/content/tabControl/TabControl";
  import GoodsList from "components/content/goods/GoodsList";
  import Scroll from "components/common/scroll/Scroll";
  import BackTop from "components/content/backTop/BackTop";

  import {getHomeMultidata,getHomeGoods} from "network/home";

  export default {
    name: "Home",
    computed:{
      showGoods(){
        return this.goods[this.currentType].list
      }
    },
    components:{
      NavBar,
      HomeSwiper,
      RecommendView,
      FeatureView,
      TabControl,
      GoodsList,
      Scroll,
      BackTop
    },
    data() {
      return {
        bannwes:[],
        recommends:[],
        goods:{
          'pop':{page: 0,list:[]},
          'new':{page: 0,list:[]},
          'sell':{page: 0,list:[]},
        },
        currentType: 'pop',
        isShowBackTop:false,
        tabOffsetTop:0,
        isTabFixed:false,
        saveY:0,
      }
    },
    created() {
        this.getHomeMultidata(),

          this.getHomeGoods('pop'),
          this.getHomeGoods('new'),
          this.getHomeGoods('sell')
    },
    mounted(){
      // this.taboffsetTop =

    },
    activated() {
      this.$refs.scroll.scroll.scrollTo(0, this.saveY,0)
      this.$refs.scroll.scroll.refresh()
    },
    deactivated() {
      this.saveY = this.$refs.scroll.scroll.y
    },
    methods:{
      tabClick(index){
        switch (index) {
          case 0:
            this.currentType = 'pop'
            break
          case 1:
            this.currentType = 'new'
            break
          case 2:
            this.currentType = 'sell'
            break
        }
      },
      contentScroll(position){
        // console.log(position)
        this.isShowBackTop = -(position.y) > 1000

        this.isTabFixed = -(position.y) > this.tabOffsetTop;
        // console.log(this.isTabFixed)

      },
      backClick(){
        this.$refs.scroll.scroll.scrollTo(0,0,800)
      },
      loadMore(){
        this.getHomeGoods(this.currentType)
        // console.log('上拉');
        this.$refs.scroll.scroll.refresh()
      },
      swiperImageLoad() {
        // console.log(this.$refs.tabControl.$el.offsetTop);
        this.tabOffsetTop = this.$refs.tabControl.$el.offsetTop
        // console.log(this.tabOffsetTop)
      },



      getHomeMultidata(){
        getHomeMultidata().then(res => {
          // console.log(res);
          this.bannwes = res.data.banner.list;
          this.recommends = res.data.recommend.list;
        })
      },
      getHomeGoods(type){
        const page = this.goods[type].page + 1
        getHomeGoods(type,page).then(res => {
          this.goods[type].list.push(...res.data.list)
          this.goods[type].page += 1

          this.$refs.scroll.finishPullUp()
        })
      }
    }
  }
</script>

<style scoped>
  #home {
    padding-top: 44px;
    height: 100vh;

    position: relative;
  }
  .home-nav {

    background-color: var(--color-tint);
    color: #ffffff;

    position: fixed;
    right: 0;
    left: 0;
    top: 0px;
    z-index: 9;
  }
  .tab-control{
    position: sticky;
    top: 44px;
  }
  .content {
    /*height: 500px;*/
    overflow: hidden;

    position: absolute;
    top: 44px;
    bottom: 49px;
    left: 0;
    right: 0;
  }
</style>
